Iolkos

Coordinates:42° 11' 3" N, 41° 38' 10" E

According to ancient Greek mythology, Aeson was the rightful king of Iolkos, but his half-brother Pelias usurped the throne. It was Pelias who sent Aeson's son Jason and the Argonauts to look for the Golden Fleece.

A history of Iolkos can be found here http://www.historyfiles.co.uk/KingListsEurope/GreeceIolkos.htm It is referenced in the following articles

Jason and the Argonauts